// credit: https://en.wikipedia.org/wiki/Vector_projection
    var bUnit = onto.getThisWithLength(1);

    var a = this.getDotProductOf(bUnit);
    var a1Scalar = a.getLength() * Math.cos(a.getAng()-bUnit.getAng());
	// correct line: var a1Scalar = this.getLength() * Math.cos(this.getAng() - bUnit.getAng());
    var a1 = bUnit.getDot(a1Scalar);
    //if(mouseIsPressed) console.log(a1);
    if(shouldDraw) {
      a1.draw(2, [0, 255, 0]);
    }

    return a1;